Northrop Grumman Sperry Marine VisionMaster FT, User Manual

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Navigation Tools Radar/Chart Radar User Guide
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Drag Radius
The Drag Radius is used as a boundary where, if violated, triggers an alert
indicating that the anchor drag limit has been exceeded.
The drag circle radius is automatically calculated as equal to the chain
length plus the distance from the hawsepipe to the CCRP. The display of
the drag circle may be switched on or off at the Display tab. The drag circle
is not rendered if the diameter is less than 2 mm on the display.
An alert is generated if the distance from CCRP to the Anchor Point
exceeds the length of the drag circle radius.
Swing Radius
The Swing radius is a circle centred on the Anchor Point with a radius
automatically calculated as equal to the distance from the Anchor Point to
the ship’s stern. The display of the swing circle may be switched on or off at
the Display tab.
Display
The Display tab includes the following anchor
display options (the default setting is all display
options enabled).

Anchor Symbol - when enabled an
anchor symbol is displayed in a purple
outline circle over the anchor position.
This symbol is displayed in both anchor
range display and anchor drop mode.
The following display options only apply when in
anchor drop mode:

Drag Ring - the drag ring is a boundary
where, if violated, triggers an alert indicating that the anchor drag
limit has been exceeded. The drag ring is displayed when the
anchor is dropped.

Swing Ring - the swing ring is centred on the Anchor Point with a
radius equal to the distance from the Anchor Point to the ship’s
stern.
The figure below shows a diagram of the Anchor Drop display options.